Revert "Changed the build scripts that WP7 Uni Tests are not executed on Windows 8 because the Emulator does not run anymore"

This reverts commit 148ca82469611b225554d4aa8ac2955e081c2d5b.
Changed the build scripts that WP7 Uni Tests are not executed on Windows 8 because the Emulator does not run anymore
Now with the correct file